What are stars? Why do those tiny points of light sparkle with different colors? How far away are they?
Astronomers use physics and mathematics to create new images
of stars. For them, the delight of seeing stars on a clear, dark night is
enhanced by searching for a unified understanding of the universe.
Key discoveries opened the study of the universe as a whole. At the beginning of this century, astronomers had a limited sense of the size of the universe. Then, in 1924, Edwin Hubble (1889-1953)...